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Note 11 - Net Loss Per Share (Tables)
3 Months Ended
Mar. 31, 2022
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
  

Three Months Ended March 31,

 
  

2022

  

2021

 
         

Net loss

 $(25,101) $(16,007)
         

Shares used to compute net loss per share – basic and diluted

  125,795,255   115,422,628 
         

Net loss per share – basic and diluted

 $(0.20) $(0.14)
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
  

Three Months Ended March 31,

 
  

2022

  

2021

 
         

Options to purchase common stock

  10,903,711   6,834,510 
         

Restricted stock units

  10,917    
         

Warrants to purchase common stock

  232,434   622,942 
         

Total potentially dilutive securities excluded from denominator of the diluted earnings per share computation

  11,147,062   7,457,452